问验证是否选中了连续工作日复选框

EN

function test(values){

    if(values.length !=5 ){
        return false;
    }

    var expected = values[0], valid = true;
    $.each(values, function(i, v){
        if( expected != v){
            valid = false;
            return false;
        }
        expected  = v == 7 ? 1 : v + 1;
    })

    if(!valid){
        return false;
    }

    return true;
}

 function checkboxlimit(checkgroup, limit){
var checkgroup=checkgroup
var limit=limit
for (var i=0; i<checkgroup.length; i++){
    checkgroup[i].onclick=function(){
    var checkedcount=0
    for (var i=0; i<checkgroup.length; i++)
        checkedcount+=(checkgroup[i].checked)? 1 : 0
    if (checkedcount>limit){
        alert("You can only select a maximum of "+limit+" checkboxes")
        this.checked=false
        }
    }
}
 }

  checkboxlimit(document.forms.world.countries, 2) // here 2 states to select only two check box